/*
 *  OpenSCAD (www.openscad.org)
 *  Copyright (C) 2009-2019 Clifford Wolf <clifford@clifford.at> and
 *                          Marius Kintel <marius@kintel.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  As a special exception, you have permission to link this program
 *  with the CGAL library and distribute executables, as long as you
 *  follow the requirements of the GNU GPL in regard to all of the
 *  software in the executable aside from CGAL.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <QMenu>
#include <QFileInfo>
#include <QFileDialog>
#include <QTextStream>
#include <QRegularExpression>
#include <QString>
#include "Console.h"
#include "printutils.h"
#include "Preferences.h"
#include "UIUtils.h"

Console::Console(QWidget *parent) : QPlainTextEdit(parent)
{
	setupUi(this);
	connect(this->actionClear, SIGNAL(triggered()), this, SLOT(actionClearConsole_triggered()));
	connect(this->actionSaveAs, SIGNAL(triggered()), this, SLOT(actionSaveAs_triggered()));
	connect(this, SIGNAL(linkActivated(QString)), this, SLOT(hyperlinkClicked(const QString&)));
	this->setUndoRedoEnabled(false);
	this->appendCursor = this->textCursor();
}

Console::~Console()
{
}

void Console::addMessage(const Message& msg)
{
	// Messages with links to source must be inserted separately,
	// since anchor href is set via the "format" argument of:
	//    QTextCursor::insertText(const QString &text, const QTextCharFormat &format)
	// But if no link, and matching colors, then concat message strings with newline inbetween.
	// This results in less calls to insertText in Console::update(), and much better performance.
	if (!this->msgBuffer.empty() && msg.loc.isNone() && this->msgBuffer.back().link.isEmpty() && 
	    (getGroupColor(msg.group) == getGroupColor(this->msgBuffer.back().group)) )
	{
		auto &lastmsg = this->msgBuffer.back().message;
		lastmsg += QChar('\n');
		lastmsg += QString::fromStdString(msg.str());
	} else {
		this->msgBuffer.push_back(
			{
				QString::fromStdString(msg.str()), 
				(getGroupTextPlain(msg.group) || msg.loc.isNone()) ? 
					QString() : 
					QString("%1,%2").arg(msg.loc.firstLine()).arg(QString::fromStdString(msg.loc.fileName())),
				msg.group
			}
		);
	}
}

// Slow due to HTML parsing required, only used for initial Console header.
void Console::addHtml(const QString& html)
{
	this->appendHtml(html+QStringLiteral("&nbsp;"));
	this->appendCursor.movePosition(QTextCursor::End);
	this->setTextCursor(this->appendCursor);
}

void Console::setFont(const QString &fontFamily, uint ptSize) {
	this->document()->setDefaultFont(QFont(fontFamily, ptSize));
}

void Console::update()
{
	// Faster to ignore block count until group of messages are done inserting.
	this->setMaximumBlockCount(0);
	for (const auto &line : this->msgBuffer) {
		QTextCharFormat charFormat;
		if (line.group != message_group::None && line.group != message_group::Echo)
			charFormat.setForeground(QBrush(QColor("#000000")));
		charFormat.setBackground(QBrush(QColor(getGroupColor(line.group).c_str())));
		if (!line.link.isEmpty()) {
			charFormat.setAnchor(true);
			charFormat.setAnchorHref(line.link);
			charFormat.setFontUnderline(true);
		}
		// TODO insert timestamp as tooltip? (see #3570)
		//   may have to get rid of concatenation feature of Console::addMessage,
		//   or just live with grouped messages using the same timestamp
		//charFormat.setToolTip(timestr);

		appendCursor.insertBlock();
		appendCursor.insertText(line.message, charFormat);
	}
	msgBuffer.clear();
	this->setTextCursor(appendCursor);
	this->setMaximumBlockCount(Preferences::inst()->getValue("advanced/consoleMaxLines").toUInt());
}

void Console::actionClearConsole_triggered()
{
	this->msgBuffer.clear();
	this->document()->clear();
	this->appendCursor = this->textCursor();
}

void Console::actionSaveAs_triggered()
{
	const auto& text = this->document()->toPlainText();
	const auto fileName = QFileDialog::getSaveFileName(this, _("Save console content"));
	QFile file(fileName);
	if (file.open(QIODevice::ReadWrite)) {
		QTextStream stream(&file);
		stream << text;
		stream.flush();
		LOG(message_group::None,Location::NONE,"","Console content saved to '%1$s'.",fileName.toStdString());
	}
}

void Console::contextMenuEvent(QContextMenuEvent *event)
{
	// Clear leaves characterCount() at 1, not 0
	const bool hasContent = this->document()->characterCount() > 1;
	this->actionClear->setEnabled(hasContent);
	this->actionSaveAs->setEnabled(hasContent);
	QMenu *menu = createStandardContextMenu();
	menu->insertAction(menu->actions().at(0), this->actionClear);
	menu->addSeparator();
	menu->addAction(this->actionSaveAs);
	menu->exec(event->globalPos());
	delete menu;
}

void Console::hyperlinkClicked(const QString& url)
{
	if (url.startsWith("http://") || url.startsWith("https://")) {
		UIUtils::openURL(url);
		return;
	}

	const QRegularExpression regEx("^(\\d+),(.*)$");
	const auto match = regEx.match(url);
	if (match.hasMatch()) {
		const auto line = match.captured(1).toInt();
		const auto file = match.captured(2);
		const auto info = QFileInfo(file);
		if (info.isFile()) {
			if (info.isReadable()) {
				emit openFile(file, line - 1);
			}
		} else {
			openFile(QString(), line - 1);
		}
	}
}
